JP2022045728A - Optical transmission device, optical transmission method, and program - Google Patents

Abstract

To provide an optical transmission device capable of providing redundancy to a dummy light source with a structure which necessitates simple control.SOLUTION: An optical transmission device 1 comprises: a synthesis unit 1a that synthesizes signal light of a main signal with dummy light of each of odd and even channels using first and second dummy light sources as light sources; a detection unit 1b; and a control unit 1c. The detection unit 1b detects an abnormality of the first dummy light source and an abnormality of the second dummy light source. The control unit 1c executes additional control. The additional control includes control to additionally synthesize the dummy light of the even channel using the first dummy light source as the light source with the signal light of the main signal by the synthesis unit 1a when the detection unit 1b detects the abnormality of the second dummy light source while detecting no abnormality of the first dummy light source. The additional control includes control to additionally synthesize the dummy light of the odd channel using the second dummy light source as the light source with the signal light of the main signal by the synthesis unit 1a when the detection unit 1b detects the abnormality of the first dummy light source while detecting no abnormality of the second dummy light source.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to optical transmission devices, optical transmission methods, and programs.

Optical transmission devices such as optical wavelength division multiplexing devices installed in submarine cable systems are equipped with one dummy light source to compensate for the total optical power in the frequency band used when transponder signal light is not inserted. May have been.

As a technique for dealing with a failure of a dummy light source, for example, Patent Document 1 describes a wavelength division multiplexing transmission device in which the dummy light source has redundancy for the purpose of improving the reliability of the device.

The apparatus described in Patent Document 1 includes a plurality of signal light transmission units that output signal lights having different center wavelengths, and a dummy light output unit that outputs dummy light having a center wavelength different from that of the plurality of signal lights. It is equipped with a wave device and an optical amplifier. The optical combiner combines signal light output from the plurality of signal light transmission units and dummy light output from the dummy light output unit, and the optical amplifier combines wavelength-multiplexed light from the optical combiner. Is amplified and sent to the optical transmission line. The dummy light output unit includes a plurality of dummy light sources that output dummy light close to the center wavelength set in the dummy light output unit, and an optical coupler that combines the dummy light output from the plurality of dummy light sources. , A dummy light source control unit, and the like. The dummy light source control unit measures the optical output level of the dummy light combined with the optical coupler, and measures the optical output levels of the plurality of dummy light sources so that the measured optical output level becomes a predetermined value. Control.

Japanese Unexamined Patent Publication No. 2008-141674

A technology that enables control of a dummy light source with redundancy by a simpler method than the wavelength division multiplexing transmission device described in Patent Document 1 in order to increase the variety in terms of cost and design when constructing an optical transmission system. Is desired.

An object of the present disclosure is to solve such a problem, and to provide an optical transmission device, an optical transmission method, and a program capable of giving redundancy to a dummy light source with a configuration that requires simple control. be.

The optical transmission device according to the first aspect of the present disclosure includes signal light of a main signal, odd-channel dummy light using a first dummy light source as a light source, and even-channel dummy light using a second dummy light source as a light source. , The detection unit that detects the abnormality of the first dummy light source and the abnormality of the second dummy light source, and the second dummy that the detection unit has no abnormality in the first dummy light source. When an abnormality in the light source is detected, dummy light of an even channel using the first dummy light source as a light source is additionally combined with the signal light of the main signal in the combine unit, and the second dummy light is added to the detection unit. When there is no abnormality in the light source and an abnormality in the first dummy light source is detected, dummy light of an odd channel using the second dummy light source as a light source is additionally combined with the signal light of the main signal in the combine section. It is provided with a control unit that performs additional control such as.

The optical transmission method according to the second aspect of the present disclosure includes signal light of a main signal, odd-channel dummy light using a first dummy light source as a light source, and even-channel dummy light using a second dummy light source as a light source. , A detection step for detecting an abnormality in the first dummy light source and an abnormality in the second dummy light source, and a second dummy in the detection step where there is no abnormality in the first dummy light source. When an abnormality in the light source is detected, dummy light of an even channel using the first dummy light source as a light source is additionally combined with the signal light of the main signal in the combined wave step, and the second dummy is added in the detection step. When there is no abnormality in the light source and an abnormality in the first dummy light source is detected, dummy light of an odd channel using the second dummy light source as a light source is additionally combined with the signal light of the main signal in the combined wave step. It is provided with a control step for performing additional control such as.

The program according to the third aspect of the present disclosure comprises signal light of a main signal, odd-channel dummy light having a first dummy light source as a light source, and even-channel dummy light having a second dummy light source as a light source. A detection step for detecting an abnormality in the first dummy light source and an abnormality in the second dummy light source in a computer provided in a combined optical transmission device, and a detection step in which there is no abnormality in the first dummy light source. When an abnormality of the second dummy light source is detected, even-channel dummy light using the first dummy light source as a light source is additionally combined with the signal light of the main signal, and is combined with the signal light of the main signal to the second dummy light source in the detection step. When there is no abnormality and an abnormality of the first dummy light source is detected, additional control is performed so that the dummy light of an odd channel using the second dummy light source as a light source is additionally combined with the signal light of the main signal. It is a program for executing control steps.

INDUSTRIAL APPLICABILITY According to the present disclosure, it is possible to provide an optical transmission device, an optical transmission method, and a program capable of giving redundancy to a dummy light source with a configuration that requires simple control.

It is a block diagram which shows one configuration example of the optical transmission apparatus which concerns on Embodiment 1. FIG. It is a flow diagram for demonstrating an example of an optical transmission method in the optical transmission apparatus of FIG. It is a block diagram which shows one configuration example of the optical wavelength division multiplexing transmission apparatus which concerns on Embodiment 2. FIG. It is a flow diagram for demonstrating an example of the setting process of the dummy light from the external monitoring control apparatus with respect to the optical wavelength division multiplexing transmission apparatus of FIG. It is a flow diagram for demonstrating an example of the dummy light adjustment processing in the optical wavelength division multiplexing transmission apparatus of FIG. It is a flow chart following FIG. It is a flow chart following FIG. It is a flow chart following FIG. It is a schematic diagram which shows the transition example of the optical signal arrangement of the dummy light adjusted by the dummy light adjustment process of FIGS. 5 to 8. It is a flow diagram for demonstrating an example of the dummy light compensation process (recovery process) executed when the 1st dummy light source unit fails in the optical wavelength division multiplexing transmission apparatus of FIG. It is a schematic diagram which shows the transition example of the optical signal arrangement of the dummy light adjusted by the recovery process of FIG. It is a flow diagram for demonstrating an example of the restoration process executed when the 1st dummy light source part is exchanged in the optical wavelength division multiplexing transmission apparatus of FIG. It is a flow chart following FIG. It is a flow chart following FIG. It is a schematic diagram which shows the transition example of the optical signal arrangement of the dummy light adjusted by the restoration process of FIGS. 12-14. It is a schematic diagram which shows the transition example following FIG. It is a block diagram which shows the structure of the optical wavelength division multiplexing transmission apparatus which concerns on a comparative example. It is a block diagram which shows one configuration example of the optical wavelength division multiplexing transmission apparatus which concerns on Embodiment 3. FIG. It is a figure which shows an example of the hardware composition of a device.

Hereinafter, embodiments will be described with reference to the drawings. In the embodiment, the same or equivalent elements may be designated by the same reference numerals, and duplicate description may be omitted. In addition, there is a drawing that draws a one-way arrow in the drawing explained below, but this arrow simply shows the direction of the flow of a certain signal (data) and excludes bidirectionality. is not it.

<Embodiment 1>
The optical transmission device according to the first embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration example of an optical transmission device according to the first embodiment.

As shown in FIG. 1, the optical transmission device 1 according to the present embodiment can include a wave wave unit 1a, a detection unit 1b, and a control unit 1c. The optical transmission device 1 can be incorporated into, for example, a submarine cable system or the like.

The combined wave unit 1a combines the signal light of the main signal, the odd-numbered channel dummy light using the first dummy light source as the light source, and the even-numbered channel dummy light using the second dummy light source as the light source. Further, any dummy light can be inserted to compensate for the intensity of the light output (light output power), for example, always or depending on the presence or absence of the signal light of the main signal. Inserting dummy light depending on the presence or absence of the signal light of the main signal means that the dummy light is placed at a position (the wavelength may be the same or different) that overlaps with the signal light of the main signal, and the signal light is inserted. When it overlaps with, it can mean that the light is turned off manually (operated by the administrator) or automatically. As the method of inserting the dummy light into the signal light of the main signal, a known technique may be adopted.

Here, the odd-numbered channel and the even-numbered channel can refer to the odd-numbered channel and the even-numbered channel, respectively, in the channel group arranged in order according to the magnitude relation of the frequency or the wavelength. In the following, the explanation will be made on the premise that the above magnitude relation is the magnitude relation of the center frequency, but the magnitude relation about the frequency band of the channel, the magnitude relation about the center wavelength of the channel, the magnitude relation about the wavelength band of the channel, etc. The magnitude relationship may be based on other criteria. In addition, when arranging in order, they can be arranged at predetermined intervals based on the center frequency, center wavelength, etc., but it is also possible to make the intervals different as long as it can be said that the adjacent odd-numbered channels and even-numbered channels do not interfere with each other. be.

Alternatively, the odd-numbered channel can be defined as a channel having an odd number of predetermined digits at the center wavelength or the center frequency, and the even-numbered channel can be defined as a channel having an even number of values with the predetermined number of digits. In this case, the odd-numbered channel and even-numbered channel dummy light are odd-numbered wavelength and even-numbered wavelength dummy light, or odd-numbered and even-numbered frequency dummy light, respectively. Of course, the digit value used in this definition can be the value of the result of arithmetic processing such as rounding, rounding up, and rounding down.

In addition, since the combined wave as described above is performed, the optical transmission device 1 can be referred to as an optical wavelength division multiplexing device or an optical wavelength division multiplexing transmission device. Of course, the signal light itself of the main signal can also be a plurality of signal lights having different center wavelengths (different center frequencies), that is, the main signal can be a wavelength division multiplexing optical signal. Further, the optical transmission device 1 can also be configured as an optical wavelength division multiplexing / separation device.

The detection unit 1b detects an abnormality of the first dummy light source and an abnormality of the second dummy light source. The control unit 1c performs the following additional control. In the above additional control, when there is no abnormality in the first dummy light source in the detection unit 1b and an abnormality in the second dummy light source is detected, even-numbered channel dummy light using the first dummy light source as a light source is added in the combine unit 1a. The control is such that the signal light of the main signal is combined. Further, in the above additional control, when there is no abnormality in the second dummy light source in the detection unit 1b and an abnormality in the first dummy light source is detected, the dummy light of the odd channel using the second dummy light source as the light source is generated in the combine unit 1a. The control is such that the signal light of the main signal is additionally combined. The additional control may also be referred to as a channel additional control.

In other words, in the present embodiment, an abnormality of the first and second dummy light sources, which are the light sources of the odd and even channel dummy lights, is detected, and when one of the abnormalities is detected, the detected dummy light source is used. The channel that was used as the light source is output as the other dummy light source as the light source.

The control unit 1c can be realized by, for example, a CPU (Central Processing Unit), a working memory, a non-volatile storage device that stores a program for controlling the entire optical transmission device 1, and the like. That is, the control unit 1c can have a control computer in which the program for the additional control is executably incorporated. Further, the control unit 1c can be realized by a configuration including, for example, an integrated circuit.

An example of an optical transmission method including the above-mentioned additional control will be described with reference to FIG. FIG. 2 is a flow chart for explaining an example of an optical transmission method in the optical transmission device 1.

In this optical transmission method, the optical transmission device 1 converts the signal light of the main signal, the dummy light of an odd channel using the first dummy light source as a light source, and the dummy light of an even channel using the second dummy light source as a light source. Combine waves (step S1). In addition, the combined wave in step S1 may have substantially no signal light of the main signal, and as can be seen from the detection in step S2, there is no at least one of odd-numbered channel and even-numbered channel dummy light. In some cases.

In the state of step S1, the optical transmission device 1 detects an abnormality of the first dummy light source and an abnormality of the second dummy light source (step S2). Then, the optical transmission device 1 performs the following additional control (step S3).

In the above additional control, when there is no abnormality in the first dummy light source and an abnormality in the second dummy light source is detected in step S2, an even channel dummy light using the first dummy light source as a light source is additionally added as the main signal in step S1. The control shall be such that the signal light is combined. Further, in the above additional control, when there is no abnormality in the second dummy light source and an abnormality in the first dummy light source is detected in step S2, an odd-numbered channel dummy light using the second dummy light source as a light source is additionally mainly used in step S1. The control shall be such that it is combined with the signal light of the signal.

In addition, step S1, step S2, and step S3 can be referred to as a wave combination step, a detection step, and a control step, respectively, and can be executed by the wave combination unit 1a, the detection unit 1b, and the control unit 1c, respectively. Further, it can be said that the above-mentioned program is a program for causing a computer to execute the above-mentioned detection step and the above-mentioned control step. This "computer is an optical transmission device that combines the signal light of the main signal, the dummy light of the odd channel using the first dummy light source as the light source, and the dummy light of the even channel using the second dummy light source as the light source. It is a equipped computer.

Even if an abnormality occurs in one of the dummy light sources in a state where the dummy lights from the first dummy light source and the second dummy light source are combined by the additional control as described above, the following combined waves occur. Is possible. That is, the dummy light having a wavelength that has been combined with one of the dummy light sources as a light source can be combined with the other dummy light source as a light source. Therefore, according to the present embodiment, not only the dummy light source can be provided with redundancy with a simple structure, but also such a redundant configuration can be configured with simple control.

<Embodiment 2>
The second embodiment will be described mainly on the differences from the first embodiment with reference to FIGS. 3 to 17, but various examples described in the first embodiment can be applied. FIG. 3 is a diagram showing a configuration example of the optical wavelength division multiplexing transmission device according to the second embodiment. In FIG. 3, the thickest line connecting the components indicates an optical line such as an optical fiber core wire.

As shown in FIG. 3, the optical wavelength division multiplexing transmission device 3 according to the present embodiment can include a first dummy light source unit 10, a second dummy light source unit 20, and a combine wave unit 30, and is an external monitoring control device. (External terminal device) 4 can be connected by an electric wire or an optical line. Further, the optical wavelength multiplex transmission device 3 can be a device that inputs, for example, a transponder signal light compatible with optical digital coherent communication as the signal light of the main signal and outputs it to a subsequent stage. This transponder signal light can be a multiplexed signal light having a maximum wavelength number designed from 0 wave.

The first dummy light source unit 10 can include an ASE (Amplified Spontaneous Emission) light source 11 and a wavelength selection switch (WSS: Wavelength Selective Switch) 12. The ASE light source 11 is a light source that is a source of dummy light, and can be a light source that emits uniform level ASE light at a high level over the entire frequency band used. The reason why natural light (ASE light) is used as dummy light in this embodiment is to stabilize the polarization state of transponder signal light compatible with optical digital coherent communication. However, the dummy light is not limited to natural light.

Further, the dummy light can be inserted to compensate the intensity of the light output (light output power), for example, depending on the presence or absence of the signal light of the main signal. In order to insert dummy light instead of transponder signal light, it is common to make ASE light appear as light having a plurality of wavelengths (dummy light channel). Therefore, the WSS 12 performs division control and optical power control on the ASE light output from the ASE light source 11.

The WSS 12 is arranged after the ASE light source 21, and the optical output power can be adjusted by turning on / off the cut waveform (waveform obtained by the division control) as the optical power control. For example, the optical output power of the dummy light is initially adjusted with the target of the optical output power when all the signal light of the main signal is inserted, and when the signal light of the main signal is inserted, the dummy light is used. When it is OFF and not inserted, it is advisable to turn on the dummy light. It is easier to complement when the signal light of the main signal and the dummy light (dummy light output from WSS12 and WSS22 described later) have a one-to-one relationship. However, if the dummy light does not overlap the signal light when the signal light of the main signal is inserted, a small error can be obtained from the viewpoint of the total light output power, which causes a big problem in operation. do not have. The above arrangement can be, for example, an arrangement in which a plurality of waves are turned off so that the wavelength of the dummy light does not overlap with the signal light.

The first dummy light source unit 10 is an example of the first dummy light source, and outputs dummy light having an odd frequency (odd channel). In this example, the WSS 12 is configured to select and output an odd-numbered channel dummy light with respect to the ASE light output from the ASE light source 11.

For example, in WSS 12, the waveform of the dummy optical channel to be output can be set to, for example, a bandwidth of 50 GHz at a center frequency of 50 GHz, and the attenuation amount of the output power can also be set. Then, based on this setting, the WSS 12 can be automatically set to output a dummy light having a waveform whose center frequency is an odd frequency (dummy light of an odd channel) or by a further manual operation.

The second dummy light source unit 20 can include an ASE light source 21 and a WSS 22. Like the ASE light source 11, the ASE light source 21 is a light source that is a source of dummy light, and can be used as a light source that emits uniform level ASE light at a high level over the entire frequency band used. Like the WSS 12, the WSS 22 performs division control and optical power control on the ASE light output from the ASE light source 21.

The second dummy light source unit 20 is an example of the second dummy light source, and outputs dummy light having an even frequency (even channel). In this example, the WSS 22 is configured to select and output even-channel dummy light with respect to the ASE light output from the ASE light source 21.

For example, in WSS22, the waveform of the dummy optical channel to be output can be set to, for example, a bandwidth of 50 GHz at a center frequency of 50 GHz, and the attenuation amount of the output power can also be set. Then, based on this setting, the WSS 22 can be automatically set to output a dummy light having a waveform whose center frequency is an even frequency (dummy light of an even channel) or by a further manual operation. As described above, the center frequency interval and bandwidth of the waveform set by WSS22 and the attenuation amount of output power may be the same as those set by WSS12. In particular, it is preferable that the optical wavelength division multiplexing transmission device 3 adopts a configuration in which when one is set, the other is also set at the same value.

The combiner 30 is an example of the combiner 1a, and combines the transponder signal light, the dummy light input from the first dummy light source unit 10, and the dummy light input from the second dummy light source unit 20. It will wave. For this combined wave, the combined wave unit 30 can include an optical coupler 33 and an optical coupler 34.

The optical coupler 33 combines the dummy light from the first dummy light source unit 10 and the dummy light from the second dummy light source unit 20, that is, combines the dummy light channels from both sides. The optical coupler 34 combines the transponder signal light and the input light (dummy optical channel) from the optical coupler 33. In the following, the transponder signal light will be described as 0 wave in order to briefly explain the scene where the dummy light is required.

As described above, the present embodiment employs the following redundant structure for the dummy light source. That is, in this redundant structure, dummy light sources are parallelized, odd channels are alternately output from one (first dummy light source unit 10), and even channels are alternately output from the other (second dummy light source unit 20), and the optical coupler 34 outputs the odd channels alternately. It has a structure that makes waves merge.

Further, the combine wave unit 30 includes PDs (Photodiode) 31 and 32 as an example of a part of the detection unit 1b, and an example of the remaining functions of the detection unit 1b and a CPU 30a and a non-volatile memory as an example of the control unit 1c. 30b can be provided.

The PD 31 is an example of a photodetector that detects the power of the input light from the WSS 12 of the first dummy light source unit 10, and outputs the detection result to the CPU 30a. The PD 32 is an example of a photodetector that detects the power of the input light from the WSS 22 of the second dummy light source unit 20, and outputs the detection result to the CPU 30a. For example, PD31 and PD32 can be circuits for monitoring input disconnection (input power disconnection) for optical inputs from WSS12 and WSS22, respectively. The CPU 30a controls the entire optical wavelength division multiplexing transmission device 3. The non-volatile memory 30b can be a memory for storing various setting information and the like for performing various controls in the CPU 30a.

Further, the CPU 30a can detect the abnormality of the first dummy light source unit 10 by detecting the abnormality of the odd-numbered channel dummy light input from the first dummy light source unit 10 based on the output from the PD 31. For example, the CPU 30a can detect an abnormality in the first dummy light source unit 10 by detecting the input disconnection of the dummy light from the first dummy light source unit 10 based on the monitoring result obtained from the PD 31.

Similarly, the CPU 30a can detect an abnormality in the second dummy light source unit 20 by detecting an abnormality in the even-numbered channel dummy light input from the second dummy light source unit 20 based on the output from the PD 32. For example, the CPU 30a can detect an abnormality in the second dummy light source unit 20 by detecting the input disconnection of the dummy light from the second dummy light source unit 20 based on the monitoring result obtained from the PD 32.

Then, the CPU 30a has no abnormality in the first dummy light source unit 10 and an abnormality in the second dummy light source unit 20 based on the outputs from the PDs 31 and 32 as additional control (which can also be referred to as channel addition control or frequency addition control). When is detected, the following control is performed. In this case, the CPU 30a controls the first dummy light source unit 10 to additionally output even-numbered channel dummy light. The control target here can be WSS12.

As described above, in the present embodiment, even when the output of the even-numbered channels is stopped due to a failure in the second dummy light source unit 20, the odd-numbered channels of the first dummy light source unit 10 remain, so that the total optical power is attenuated. The amount is only half. Further, in the present embodiment, the total optical power can be automatically restored by immediately emitting an even number of channels from the first dummy light source unit 10 in such a case.

Further, as one of the additional controls, the CPU 30a controls as follows when there is no abnormality in the second dummy light source unit 20 and an abnormality in the first dummy light source unit 10 is detected based on the outputs from the PDs 31 and 32. I do. In this case, the CPU 30a controls the second dummy light source unit 20 to additionally output dummy light of an odd-numbered channel. The control target here can be WSS22.

As described above, in the present embodiment, even when the output of the odd-numbered channels is stopped due to a failure in the first dummy light source unit 10, the even-numbered channels of the second dummy light source unit 20 remain, so that the total optical power is attenuated. The amount is only half. Further, in the present embodiment, the total optical power can be automatically restored by immediately emitting an odd number of channels from the second dummy light source unit 20 in such a case.

As described above, when an abnormality is detected in either the first dummy light source unit 10 or the second dummy light source unit 20, the CPU 30a detects the abnormality in the dummy light source unit on the side where the abnormality is not detected. The dummy light of the channel of the dummy light source section on the side of the signal is additionally output. In the present embodiment, by such control, even if the dummy light source is abnormal, the total optical power attenuation is halved and the original attenuation can be restored immediately. Therefore, the influence of the dummy light source abnormality on the transponder signal is affected. It can be suppressed as much as possible.

Further, when any of the first dummy light source unit 10 and the second dummy light source unit 20 in which the abnormality is detected is replaced after the additional control, the CPU 30a returns to the state before executing the additional control. It is preferable to do. For example, the CPU 30a can control the non-exchanged dummy light source unit to stop the output of the dummy light of the target wavelength added in the control of adding the dummy light as the return control. The dummy light of the added target wavelength can be referred to as a dummy light of the added target frequency or a dummy light of the added target channel.

Further, the WSSs 12 and 22 can have a function of adjusting the optical output power during the additional control and / or the return control. Then, this adjustment is performed by control from the CPU 30a while referring to various setting values recorded in the non-volatile memory 30b or various setting values set in WSS12, 22 so as to maintain the total optical output power of the dummy light. Can be carried out.

As described above, the additional control is a control for adjusting so that the optical output power of the dummy light of the channel in which the abnormality is detected is compensated by the optical output power of the dummy light of the channel added to the signal light of the main signal. Can include. This adjustment refers to the adjustment for the target dummy light source among the first dummy light source unit 10 and the second dummy light source unit 20. Further, the return control may include a control for performing the same adjustment. A specific example of such adjustment of the optical output power will be described by including it in a processing example described later.

The optical wavelength division multiplexing transmission device 3 can be provided with an optical splitter 35 and an OCM 38 for the purpose of acquiring information that is a source of various controls including adjustment of the optical output power of the dummy light as described above, and is also an optical splitter. 36 and PD37 can be provided. OCM is an abbreviation for Optical Channel Monitor.

The optical splitter 35 is connected to an optical coupler 34 that combines the signal light of the main signal and the dummy light, and is a splitter for branching the combined wave light into the main path (device output side) and the monitor path (OCM38 side). Is. The OCM 38 is a monitor circuit for monitoring the combined wave light branched by the optical splitter 35, and is exemplified here as a circuit for measuring the correlation between the frequency and the optical power in the frequency band used. The optical splitter 36 is connected to the optical splitter 35 and is a splitter for branching the combined light of the main path into the main path and the monitor path (PD37 side). The PD 37 is a circuit connected to the optical splitter 35 and monitors the output power of the light that is the output of the device, and outputs the monitoring result to the CPU 30a.

Based on the outputs from the OCM 38 and PD 37, the CPU 30a controls the output of the dummy light from the WSS 12 of the first dummy light source unit 10 and the WSS 22 of the second dummy light source unit 20 in cooperation with the non-volatile memory 30b. be able to. This control can include control at the time of abnormality (at the time of failure) and control at the time of recovery.

As can be seen from the processing example described later, the CPU 30a specifically performs the following control. For example, the CPU 30a executes an instruction (control command) from the external terminal device 4, completes the internal control of the optical wavelength division multiplexing transmission device 3, and notifies the external terminal device 4 regarding a device failure. Further, the CPU 30a obtains information from the first dummy light source unit 10, the second dummy light source unit 20, OCM38, and PD31, 32, 37, and controls the first dummy light source unit 10 and the second dummy light source unit 20. Information transfer to the non-volatile memory 30b is also executed. The non-volatile memory 30b records control information about the first dummy light source unit 10 and the second dummy light source unit 20, and records information about the dummy optical channel and the optical power measurement result (measurement result by the OCM 38).

An example of processing in the optical wavelength division multiplexing transmission device 3 will be described below.
First, with reference to FIGS. 4 to 9, an example of processing in which dummy light is set in the optical wavelength division multiplexing transmission device 3 by the external terminal device 4 to adjust the first dummy light source unit 10 and the second dummy light source unit 20. explain.

First, the optical wavelength division multiplexing transmission device 3 can be configured so that dummy light can be set, and here, the setting operation will be described by the administrator of the optical wavelength division multiplexing transmission device 3 who is the user of the external terminal device 4. The external terminal device 4 can be a general-purpose computer or a dedicated control device connected to the CPU 30a of the optical wavelength multiplex transmission device 3 by an optical line (or an electric wire) via an interface (not shown). However, for example, it may be an operation unit such as a setting switch provided in the optical wavelength division multiplexing transmission device 3. Of course, when the installation environment of the optical wavelength division multiplexing transmission device 3 is a place where it is difficult to operate, for example, the seabed, the external terminal device 4 is required even when such an operation unit is provided.

Although the configuration example of the external terminal device 4 is not shown, the external terminal device 4 can include a control unit that controls the entire device, an operation unit that accepts user operations, and a communication unit that communicates with the optical wavelength division multiplexing transmission device 3. FIG. The setting can be made by the setting process as illustrated in. FIG. 4 is a flow chart for explaining an example of a dummy light setting process from the external terminal device 4 for the optical wavelength division multiplexing transmission device 3.

First, the user sets the output power batch attenuation, which is a common value between the waveform of the dummy light channel of the dummy light output from the operation unit of the external terminal device 4 and the output power attenuation of each channel. The value X [dB] is input (step S11). The waveform can be input, for example, with a center frequency of 50 GHz and a bandwidth of 50 GHz.

Further, when the user provides a difference in the output power attenuation amount of each channel of the dummy light in the first dummy light source unit 10, the output power adjustment amount (increase / decrease value) of each channel from the operation unit + Y / -Z (+ is Power decrease,-is power increase) [dB] is input (step S12). Thereby, the output power attenuation amount for each channel can be set as a value of X + Y [dB] or XZ [dB]. Further, the user inputs a set value T [dBm] of the device output power of the optical wavelength division multiplexing transmission device 3 from the operation unit (step S13). The order of steps S11 to S13 does not matter. Here, an example in which the set value for the first dummy light source unit 10 is also used in the second dummy light source unit 20 will be described.

Next, the user performs a dummy light adjustment start operation (or an operation of confirming various input values) from the operation unit in the external terminal device 4 (step S14). In response to this operation, in the external terminal device 4, the control unit transmits a dummy optical adjustment instruction to the CPU 30a of the optical wavelength division multiplexing transmission device 3 via the communication unit (step S15). It is assumed that the dummy light adjustment instruction includes information indicating various setting values input in steps S11 to S13. Of course, various setting values can be transmitted each time they are input.

After that, the external terminal device 4 waits for the completion notification of the dummy optical adjustment process (process of FIGS. 5 to 8) transmitted from the optical wavelength division multiplexing transmission device 3 (from the CPU 30a) (step S16), and is completed via the communication unit. When the notification is received (when YES is reached), the setting process is completed.

An example of this dummy light adjustment process on the optical wavelength division multiplexing transmission device 3 side will be described with reference to FIGS. 5 to 9. 5A and 5B are flow charts for explaining an example of dummy light adjustment processing in the optical wavelength division multiplexing transmission device 3, FIG. 6 is a flow chart following FIG. 5, FIG. 7 is a flow chart following FIG. 6, and FIG. 8 is a flow chart. It is a flow chart following FIG. Further, FIG. 9 is a schematic diagram showing a transition example of the optical signal arrangement of the dummy light adjusted by the dummy light adjustment processing of FIGS. 5 to 8.

When the optical wavelength division multiplexing transmission device 3 receives the adjustment instruction in step S15, the optical wavelength division multiplexing transmission device 3 starts the dummy optical adjustment process. First, in the combine wave unit 30, the CPU 30a transmits information (waveform information) indicating the waveform of the dummy light to be output from the first dummy light source unit 10 included in the adjustment instruction to the WSS 12 (step S21). Further, the CPU 30a transmits information (output power attenuation amount information) indicating the output power attenuation amount of the dummy light to be output from the first dummy light source unit 10 included in the adjustment instruction to the WSS 12 (step S22). The transmission paths of steps S21 and S22 are shown by the path a1 in FIG.

The first dummy light source unit 10 that has received the information transmitted in steps S21 and S22 sets the waveform information and the output power attenuation amount information in the WSS 12, whereby the dummy light is set as illustrated by the dummy light DL1 in FIG. All channels of are output (step S23). That is, as illustrated as the dummy light DL1, at this stage, not only odd-numbered channels but also even-numbered channels of dummy light are output, which also serves as a test for dummy light compensation processing (recovery processing) in the event of an abnormality. Can be done.

Next, in the combine wave unit 30, the OCM 38 measures the correlation between the frequency and the optical power in the frequency band used by the optical wavelength division multiplexing transmission device 3 (step S24). Then, the CPU 30a compares the center frequency shown in the waveform information stored in the non-volatile memory 30b with the OCM measurement result, and correlates the dummy optical channel with the measured optical power measurement value (OCM measurement value) (OCM measurement value). Step S25).

The CPU 30a obtains an adjustment amount difference (hereinafter, adjustment amount difference Adj1) based on the channel having the maximum power in the output power adjustment amount (set value in the external terminal device 4) of the dummy optical channel (step S26). Further, the CPU 30a obtains an adjustment amount difference (hereinafter, adjustment amount difference Adj2) based on the optical power measurement value (OCM measurement value) of the reference channel (step S27).

Next, the CPU 30a compares the adjustment amount difference Adj1 and the adjustment amount difference Adj2, and determines whether or not they are different (step S28). If the CPU 30a is different (YES in step S28), the adjustment amount W (= Adj1-Adj2) is calculated, and the previous attenuation amount + W is fed back (FB) as the output power attenuation amount (step S29). This FB returns to step S22, that is, the output power attenuation amount increased by + W from the CPU 30a to the WSS12 of the first dummy light source unit 10 (to the WSS22 of the second dummy light source unit 20 after passing through step S38 described later). Can be implemented by sending. It should be noted that the determination in step S28 can also be performed depending on whether or not the adjustment amount W is obtained and it is 0 (or a range that can be regarded as 0).

On the other hand, if NO in step S28, the CPU 30a causes the PD 37 to measure the optical power in the frequency band used, and obtains a measurement result (step S30). In step S30, the PD37 can be constantly measured, and the measurement result at the time when NO is obtained in step S28 can be obtained. The CPU 30a obtains the difference between the device output power T (set value in the external terminal device 4) and the optical power measured value (PD measured value) in the PD 37 (step S31), and determines whether or not there is a difference (step S31). Step S32).

When there is a difference (YES in step S32), the CPU 30a calculates the adjustment amount U (= PD measured value −T) and FBs the previous attenuation amount + U as the output power attenuation amount (step S33). This FB can be carried out by returning to step S22. That is, the CPU 30a transmits the output power attenuation amount information indicating the output power attenuation amount increased by + U to the WSS 12 of the first dummy light source unit 10 (to the WSS 22 of the second dummy light source unit 20 after passing through step S38). , FB can be carried out.

When there is no difference (NO in step S32), the CPU 30a determines whether or not the adjustment is currently made for the first dummy light source unit 10 (step S34). When the first dummy light source unit 10 is the target of adjustment (YES in step S34), the CPU 30a records various information in the non-volatile memory 30b (step S35). The various information recorded here includes waveform information (center frequency 50 GHz interval, bandwidth 50 GHz), output power attenuation information, and dummy optical channel and optical power measurement information (OCM measurement) for the first dummy light source unit 10. Information) is included.

The CPU 30a transmits an instruction (output cutoff information) for blocking the output of the dummy light to the first dummy light source unit 10 via the path a1, and activates the second dummy light source unit 20 to the second dummy light source unit 20. The instruction to be used is transmitted by the route a2 (step S36). This activation instruction is an instruction to activate the second dummy light source unit 20 with the waveform information and the output power attenuation amount information of the first dummy light source unit 10 recorded in the non-volatile memory 30b.

According to the instruction in step S36, the first dummy light source unit 10 sets the output cutoff information in the WSS 12, whereby the output of all channels of the dummy light is stopped (step S37). Further, according to the instruction in step S36, the second dummy light source unit 20 sets the waveform information and the output power attenuation amount information in the WSS 22, whereby all channels of the dummy light are output as illustrated by the dummy light DL2 in FIG. (Step S38). After that, the process returns to step S24, and the process relating to the second dummy light source unit 20 is executed.

On the other hand, when the second dummy light source unit 20 is the target of adjustment (NO in step S34), the CPU 30a records various information in the non-volatile memory 30b (step S39). The various information recorded here includes waveform information (center frequency 50 GHz interval, bandwidth 50 GHz), output power attenuation information, and dummy optical channel and optical power measurement information (OCM measurement) for the second dummy light source unit 20. Information) is included.

The CPU 30a transmits an instruction to output the odd-numbered channels to the first dummy light source unit 10 to block the even-numbered channels on the path a1, and outputs the even-numbered channels to the second dummy light source unit 20 to block the odd-numbered channels. The instruction is transmitted by the route a2 (step S40).

According to the instruction in step S40, the first dummy light source unit 10 sets the output power attenuation amount information of the odd-numbered channels recorded in the non-volatile memory 30b and included in the instruction in the WSS 12, and sets the output cutoff information for the even-numbered channels. (Step S41). In step S41, with such a setting, an odd-numbered channel of the dummy light is output from the WSS 12 as illustrated by the dummy light DL3 in FIG. Next, the first dummy light source unit 10 notifies the CPU 30a of the completion of its own adjustment via the path b1 (step S42).

According to the instruction in step S40, the second dummy light source unit 20 sets the output power attenuation amount information of the even-numbered channels recorded in the non-volatile memory 30b and included in the instruction in the WSS 22, and sets the output cutoff information for the odd-numbered channels. (Step S43). In step S43, with such a setting, an even channel of the dummy light is output from the WSS 22 as illustrated by the dummy light DL3 in FIG. Next, the second dummy light source unit 20 notifies the CPU 30a of the completion of its own adjustment via the path b2 (step S44).

When the CPU 30a receives the notification of the completion of adjustment for the first dummy light source unit 10 and the second dummy light source unit 20 transmitted in steps S42 and S44, the CPU 30a notifies the external terminal device 4 of the completion of the dummy light adjustment process (step). S45). By transmitting this notification, YES is determined in step S16 of FIG. 4, and the completion of adjustment can be confirmed in the external terminal device 4.

Next, referring to FIGS. 10 and 11, a dummy light compensation process (recovery process) executed when the first dummy light source unit 10 fails (becomes abnormal) in the optical wavelength division multiplexing transmission device 3 An example will be described from the stage of starting operation. In addition, even if the second dummy light source unit 20 side fails, it can be explained basically in the same way. FIG. 10 is a flow chart for explaining this recovery process. Note that this recovery process can also be referred to as a failure recovery process. Further, FIG. 11 is a schematic diagram showing a transition example of the optical signal arrangement of the dummy light adjusted by the recovery process of FIG.

The operation of the optical wavelength division multiplexing transmission device 3 is started by transmitting an operation start instruction from the external terminal device 4 to the CPU 30a (step S51) and receiving the operation start instruction by the CPU 30a. This start instruction can be triggered by a user operation or the like. The CPU 30a can also record the state of being in operation due to the start of operation in the non-volatile memory 30b together with the start date and time.

In the combine wave unit 30, the CPU 30a receives the operation start instruction and starts alarm monitoring for monitoring the presence / absence of optical input disconnection information transmitted from the PD 31 on the route c1 and transmitted from the PD 32 on the route c2 (step). S52).

A case where a failure occurs in the first dummy light source unit 10 and the output of the dummy light is stopped (step S53) will be described as illustrated by the dummy light DL4 in FIG. The CPU 30a detects that this output stop, that is, the input disconnection from the first dummy light source unit 10 has occurred by obtaining the optical input interruption information from the PD 31, and the first dummy light source unit 10 is connected to the external terminal device 4. Notify that the failure has occurred (step S54). The external terminal device 4 receives this notification, that is, that the first dummy light source unit 10 has failed and the optical input from the first dummy light source unit 10 has been cut off (step S55).

Further, in connection with step S54, the first dummy light source unit 10 can have a failure detection function of detecting a failure and transmitting failure information to the CPU 30a. The CPU 30a can also receive failure information from the first dummy light source unit 10 on the path b1, and even when such failure information is received, the external terminal device 4 is informed that the first dummy light source unit 10 has failed. The process after the step S56, which will be described later, is also executed in the same manner. Of course, the second dummy light source unit 20 can also have a failure detection function.

Following step S54, the CPU 30a outputs an instruction to the second dummy light source unit 20 to output an odd-numbered channel that was output by the first dummy light source unit 10 but was cut off due to a failure (step a2). S56). This instruction can be an instruction including the output power attenuation amount information of the odd-numbered channels recorded in the non-volatile memory 30b. Although the output power attenuation amount information is the information recorded for the second dummy light source unit 20, it can also be the information recorded for the first dummy light source unit 10. According to the instruction in step S56, the second dummy light source unit 20 sets the output power attenuation amount information of the odd-numbered channels included in the above instruction in the WSS 22. With this setting, all channels of the dummy light are output from the WSS 22 as illustrated by the dummy light DL2 in FIG. 11 (step S57).

The dummy optical DL2 in FIG. 11 shows the state after being finally adjusted to the output based on the set value, but the output of this channel is initially smaller than the others and is gradually adjusted. You may. In this way, the CPU 30a compensates the WSS 22 for the optical output power (optical output power due to the blocked dummy light) of the odd-numbered channel dummy light on the first dummy light source unit 10 side where the abnormality is detected. Adjustments can be made. This compensation will be made by the optical output power of the dummy light of the added channel.

Next, the second dummy light source unit 20 notifies the CPU 30a of the completion of the recovery operation (recovery operation release information) by the path b2 (step S58). Upon receiving this notification, the CPU 30a notifies the external terminal device 4 of the completion of the recovery operation (recovery operation cancellation information) by the second dummy light source unit 20 (step S59). The external terminal device 4 receives the notification of the completion of the recovery operation of the second dummy light source unit 20 (step S60), and the external terminal device 4 can confirm the completion of the recovery operation.

Next, referring to FIGS. 12 to 16, an example of the recovery process executed when the first dummy light source unit 10 is replaced as the fault unit in the optical wavelength division multiplexing transmission device 3 (after the fault unit is replaced). explain. The same applies to the replacement of a part of the first dummy light source unit 10, and basically the same concept can be explained when the second dummy light source unit 20 side is replaced due to a failure. 12 is a flow chart for explaining this restoration process, FIG. 13 is a flow chart following FIG. 12, and FIG. 14 is a flow chart following FIG. 13. 15 is a schematic diagram showing a transition example of the optical signal arrangement of the dummy light adjusted by the restoration process of FIGS. 12 to 14, and FIG. 16 is a schematic diagram showing a transition example following FIG.

First, when the recovery process of the second dummy light source unit 20 is not completed and is in operation at the time when the first dummy light source unit 10 is replaced with a spare part, the first dummy light source unit 10 is the first. The output of all channels of the dummy light source unit 10 is cut off (step S71). Step S71 also includes a process of reconnecting the optical wiring to the first dummy light source unit 10 after replacement. If the recovery process of the second dummy light source unit 20 is completed at the stage of replacing with a spare part, the output of all channels is cut off in the first dummy light source unit 10.

After the optical wiring is reconnected, the user instructs the external terminal device 4 to start the restoration process accompanying the replacement of the first dummy light source unit 10 (step S72). This instruction will be transmitted from the external terminal device 4 to the CPU 30a. The CPU 30a determines whether or not the first dummy light source unit 10 after replacement has an abnormality (failure) (step S73), and if there is an abnormality, notifies the external terminal device 4 of the abnormality (step S74). ). In this case, the external terminal device 4 receives the abnormality and ends the process (step S75). Regardless of the method for determining the presence or absence of an abnormality in step S73, the determination may be performed by a predetermined determination method.

If there is no abnormality in the first dummy light source unit 10 after replacement (NO in step S73), the CPU 30a transmits the following instruction. That is, the CPU 30a transmits an instruction (output cutoff information) for blocking the output of the shortest wave of the odd-numbered channel to the second dummy light source unit 20 via the path a2, and the shortest wave of the odd-numbered channel to the first dummy light source unit 10. Is transmitted by the route a1 (step S76). The former instruction can include information indicating the shortest wave of the odd-numbered channel of the second dummy light source unit 20 recorded in the non-volatile memory 30b. The latter instruction is an instruction to set with the waveform information and the output power attenuation amount information about the shortest wave of the odd channel of the first dummy light source unit 10 recorded in the non-volatile memory 30b.

According to the instruction in step S76, the second dummy light source unit 20 sets the output cutoff information in the WSS 22 for the shortest wave of the odd-numbered channel of the second dummy light source unit 20, whereby the output of only the target channel is cut off (step S77). ). Here, the target channel whose output is cut off is exemplified by the channel having a center frequency of 195.900 THz in the dummy optical DL5 of FIG.

According to the instruction in step S76, the first dummy light source unit 10 sets the waveform information and the output power attenuation amount information for the shortest wave of the odd-numbered channel of the first dummy light source unit 10 in the WSS 12, whereby only the target channel is output. (Step S78). The target channel output here is an example of a channel having a center frequency of 195.900 THz in the dummy optical DL 6 of FIG. Note that FIG. 15 gives an example in which the output of this channel in the dummy optical DL 6 has a smaller value than the others, but this is for the purpose of explaining an example in which it is determined that there is a difference in step S82 described later, and finally. The output will be adjusted based on the set value.

Next, in the combine wave unit 30, the OCM 38 measures the correlation between the frequency and the optical power in the frequency band used by the optical wavelength division multiplexing transmission device 3 (step S79). Note that step S79 can be carried out after waiting for the completion of the processes of steps S77 and S78. Then, the CPU 30a compares the center frequency shown in the waveform information of the target channel with the OCM measurement result, and correlates the target channel with the optical power measured value (OCM measured value) (step S80). Next, the CPU 30a obtains the difference between the optical power measured value (previous OCM measured value) recorded in the non-volatile memory 30b of the target channel and the current optical power measured value (current OCM measured value) (step S81).

The CPU 30a determines whether or not there is a difference (step S82), and if so, calculates the adjustment amount W (= current value-previous value) and FBs the previous attenuation amount + W as the output power attenuation amount. (Step S83). In this FB, the CPU 30a transmits the output power attenuation amount information indicating the output power attenuation amount increased by + W to the WSS12 of the first dummy light source unit 10, and the first dummy light source unit 10 sets the output power attenuation amount information. This can be carried out (step S84). After step S84, the process returns to step S79.

On the other hand, when there is no difference as illustrated in the dummy light DL7 or the dummy light DL8 in FIG. 15 (NO in step S82), the CPU 30a determines whether or not the controlled target channel exists (remains) (whether or not there is a controlled channel). Step S85). The dummy optical DL7 shows the case where the shortest wave (195.900 THz) becomes the control target channel and is adjusted, and the dummy optical DL8 shows the case where the next short wave (195.800 THz) becomes the control target channel and is adjusted. It shows the case where it was done.

As illustrated in the dummy optical DL3 of FIG. 9, the CPU 30a notifies the external terminal device 4 that the failure unit recovery of the first dummy light source unit 10 is completed when there is no control target channel (NO in step S85). Step S86). The external terminal device 4 receives this notification (step S87) and ends the process.

On the other hand, when there is a channel to be controlled (YES in step S85), the CPU 30a transmits the following instruction. That is, the CPU 30a transmits an instruction (output cutoff information) to cut off the output of the next short wave of the odd-numbered channel to the second dummy light source unit 20 on the path a2, and sends an instruction (output cutoff information) to the first dummy light source unit 10 next to the odd-numbered channel. An instruction for setting the short wave of the above is transmitted on the path a1 (step S88). The former instruction can include information indicating the next short wave of the odd-numbered channel of the second dummy light source unit 20 recorded in the non-volatile memory 30b. The latter instruction is an instruction to set the waveform information and the output power attenuation amount information for the next short wave of the odd-numbered channel of the first dummy light source unit 10 recorded in the non-volatile memory 30b.

According to the instruction in step S88, the second dummy light source unit 20 sets the output cutoff information in the WSS 22 for the short wave next to the odd channel of the second dummy light source unit 20, whereby the output of only the target channel is cut off (step). S89). Here, the target channel whose output is cut off is exemplified by the channel having a center frequency of 195.800 THz in the dummy optical DL 9 of FIG.

Next, according to the instruction in step S88, the first dummy light source unit 10 sets waveform information and output power attenuation information for the next short wave of the odd-numbered channel of the first dummy light source unit 10 in the WSS 12, thereby outputting only the target channel. (Step S90). After step S90, the process returns to step S79. The target channel output in step S90 is exemplified by a channel having a center frequency of 195.800 THz in the dummy optical DL10 of FIG. Note that FIG. 16 gives an example in which the output of this channel in the dummy optical DL 10 has a smaller value than the others, but it is determined that there is a difference in step S82 after returning to step S79, and finally the set value is set. It will be adjusted to the output based on.

Next, in order to explain the effect of the present embodiment, the optical wavelength division multiplexing transmission device according to the comparative example will be described with reference to FIG. FIG. 17 is a block diagram showing a configuration of an optical wavelength division multiplexing transmission device according to a comparative example. In FIG. 17, the thickest line connecting the components indicates an optical line such as an optical fiber core wire.

As shown in FIG. 17, the optical wavelength division multiplexing transmission device 6 according to the comparative example is equipped with one dummy light source unit 62 for correcting the total optical power in the frequency band used when the transponder signal light is not inserted. At the same time, the combine wave section 60 is mounted. The dummy light source unit 62 includes an ASE light source 62a for using ASE light as dummy light, and a WSS 62b for dividing control and optical power control of ASE light.

The combiner unit 60 includes a CPU 60a that controls the entire unit, a non-volatile memory 60b that stores various information, a PD61 that detects an optical input interruption from the dummy light source unit 62, a transponder signal light, and an input light (dummy) from the PD61. It is provided with an optical coupler 64 that combines light). Further, the combiner unit 60 includes an optical splitter 65 that is connected to the optical coupler 64 and branches the combined wave light, and an OCM 68 that is a monitor circuit for monitoring the combined wave light branched by the optical splitter 65. The other combined light branched by the optical splitter 65 becomes the device output of the optical wavelength division multiplexing transmission device 6. Further, an external terminal device 60c is connected to the CPU 30a for various settings by the user.

Since the optical wavelength division multiplexing transmission device 6 has only the ASE light source 62a and the WSS 62b connected in series and has no other redundant configuration, the dummy light stops outputting when any part fails, and the light is emitted. The total power cannot be corrected.

On the other hand, as described above, the optical wavelength division multiplexing transmission device 3 according to the present embodiment includes a redundant configuration of a dummy light source that corrects the total optical power in the frequency band used when the transponder signal light is not inserted. , This redundant configuration can perform the following control. That is, in this redundant configuration, as illustrated by the dummy optical DL3, odd-numbered channels are normally output from the first dummy light source unit 10 and even-numbered channels are alternately output from the second dummy light source unit 20. When an error occurs in the first dummy light source unit 10 and the output of the odd-numbered channels is stopped, the even-numbered channels of the second dummy light source unit 20 remain, so that the total optical power attenuation is halved. Further, in the present embodiment, the total optical power can be automatically restored by immediately emitting an odd number of channels from the second dummy light source unit 20. As a result, in the present embodiment, the influence on the transponder signal can be suppressed as much as possible as compared with the comparative example.

As described above, in the present embodiment, the dummy light source is made redundant by providing the first dummy light source unit 10 and the second dummy light source unit 20 so that the channels output from each other can be used in normal times. There is. Therefore, in the present embodiment, even if one of the units of the first dummy light source unit 10 and the second dummy light source unit 20 fails, the other unit automatically calculates the total optical power of the output of the optical wavelength division multiplexing transmission device 3. It can be restored and the reliability of the dummy light source is improved. Further, in the present embodiment, even at the moment when one of the units fails, half of the channels of the other unit remain, so that the temporary power change of the transponder signal is compared with the state where the dummy light is not input. It can be kept small. Therefore, in the present embodiment, the influence on the signal can be suppressed as much as possible even at the moment of such a failure.

<Embodiment 3>
The third embodiment will be described with reference to FIG. 18, focusing on the differences from the second embodiment, and the description of the portion corresponding to the second embodiment will be omitted as appropriate. However, various examples described in the first and second embodiments can be appropriately applied to the third embodiment. FIG. 18 is a block diagram showing a configuration example of the optical wavelength division multiplexing transmission device according to the third embodiment. In FIG. 18, the thickest line connecting the components indicates an optical line such as an optical fiber core wire.

As shown in FIG. 18, the optical wavelength multiplex transmission device 9 according to the present embodiment is the optical wavelength multiplex transmission device 3 of FIG. 3 in which WSSs 12 and 22 are provided on the combiner side.

Specifically, the optical wavelength division multiplexing transmission device 9 includes a first dummy light source unit 70 in which the WSS 12 is excluded from the first dummy light source unit 10, a second dummy light source unit 80 in which the WSS 22 is excluded from the second dummy light source unit 20, and a second dummy light source unit 80. , WSS12,22 can be provided with a combiner 90 incorporating the functions of the WSS12 and 22. The first dummy light source unit 70 includes an ASE light source 71 corresponding to the ASE light source 11, and the second dummy light source unit 80 includes an ASE light source 81 corresponding to the ASE light source 21.

In order to incorporate the functions of the WSSs 12 and 22, the combiner 90 can include the WSS93 that shares those functions and also has the functions of the optical couplers 33 and 34. As described above, the optical wavelength division multiplexing transmission device 9 incorporates the waveforms of the dummy optical channels of the first dummy light source unit 70 and the second dummy light source unit 80 and the WSS for adjusting the output power attenuation into the combine unit 90 as the WSS 93. It is common. Further, in WSS93, the combined wave of the dummy light and the transponder signal light is also carried out.

It can be said that WSS93 is an example of the following selection unit. That is, the selection unit selects an odd-channel dummy light from the dummy light input from the first dummy light source unit 70 as the dummy light to be combined with the signal light of the main signal, and inputs the dummy light from the second dummy light source unit 80. Select an even channel dummy light from the dummy light.

The combiner 90 includes a CPU 90a that is connected to an external terminal device 4 and controls the entire optical wavelength multiplex transmission device 9, and also includes a non-volatile memory 90b, PD91, PD92, an optical splitter 95, an optical splitter 96, PD97, and an OCM98. Can be prepared. The non-volatile memory 90b, PD91, PD92, optical splitter 95, optical splitter 96, PD97, and OCM98 are parts corresponding to the non-volatile memory 30b, PD31, PD32, optical splitter 35, optical splitter 36, PD37, and OCM38, respectively.

Here, the WSS93 is connected to the rear stages of the PD91 and PD92, and the optical splitter 95 is connected to the rear stage of the WSS93. Further, various setting values input from the external terminal device 4 are output to the WSS93 by the path d while the CPU 90a cooperates with the non-volatile memory 90b, and are set in the WSS93. Further, the WSS 90 will transmit an adjustment completion notification indicating the completion of the dummy light adjustment process, a recovery operation completion notification, and a cancellation notification to the CPU 90a via the path e.

The PD 91 is an example of a photodetector that detects the power of the input light from the ASE light source 71 of the first dummy light source unit 70, and outputs the detection result to the CPU 80a via the path c1. The PD 92 is an example of a photodetector that detects the power of the input light from the ASE light source 81 of the second dummy light source unit 80, and outputs the detection result to the CPU 80a via the path c2.

For example, the PD91 and PD92 can be circuits that monitor the input disconnection (input power disconnection) of the optical input from the ASE light source 71 and the ASE light source 81, respectively. The CPU 90a can detect an abnormality in the first dummy light source unit 70 by detecting the input disconnection of the dummy light from the first dummy light source unit 70 based on the monitoring result obtained from the PD 91. The CPU 90a can detect an abnormality in the second dummy light source unit 80 by detecting the input interruption of the dummy light from the second dummy light source unit 80 based on the monitoring result obtained from the PD 92.

Then, as an additional control, the CPU 90a performs the following control when there is no abnormality in the first dummy light source unit 70 and an abnormality in the second dummy light source unit 80 is detected based on the outputs from the PDs 91 and 92. In this case, the CPU 90a controls the WSS93 to additionally select (output) the even-numbered channel dummy light from the dummy light input from the first dummy light source unit 70.

As described above, in the present embodiment, even when the output of the even-numbered channels is stopped due to a failure in the second dummy light source unit 80, the odd-numbered channels caused by the first dummy light source unit 70 remain, so that the total optical light is used. The amount of power attenuation is only half. Further, in the present embodiment, in such a case, the total optical power can be automatically restored by immediately emitting an even number of channels from the input light from the first dummy light source unit 70.

Further, as one of the additional controls, the CPU 90a controls as follows when there is no abnormality in the second dummy light source unit 80 and an abnormality in the first dummy light source unit 70 is detected based on the outputs from the PDs 91 and 92. I do. In this case, the CPU 90a controls the WSS93 to additionally select (output) the odd-numbered channel dummy light from the dummy light input from the second dummy light source unit 80.

As described above, in the present embodiment, even when the output of the odd-numbered channels is stopped due to a failure in the first dummy light source unit 70, the even-numbered channels caused by the second dummy light source unit 80 remain, so that the total optical light is used. The amount of power attenuation is only half. Further, in the present embodiment, in such a case, the total optical power can be automatically restored by immediately emitting an odd number of channels from the input light from the second dummy light source unit 80.

Further, the first dummy light source unit 70 can have a failure detection function of detecting a failure and transmitting failure information to the CPU 90a. The CPU 90a can also receive failure information from the first dummy light source unit 70 on the path b1, and even when such failure information is received, the same processing may be performed. Of course, the same applies to the second dummy light source unit 80, which is transmitted to the CPU 90a via the path b2.

Further, in the present embodiment as well, it is desirable to incorporate return control as in the second embodiment. In this example, when any of the first dummy light source unit 70 and the second dummy light source unit 80 in which the abnormality is detected is replaced after the additional control, the CPU 90a returns to the state before executing the additional control. It is preferable to perform return control.

For example, the CPU 90a can perform the following control as return control after replacing the first dummy light source unit 70. That is, the CPU 90a can not only control the WSS93 to select an odd channel from the dummy light input from the first dummy light source unit 70, but also perform the following control. That is, the CPU 90a can also control to deselect the odd-numbered channels from the dummy light input from the second dummy light source unit 80 and only select the even-numbered channels.

For example, the CPU 90a can perform the following control as return control after replacing the second dummy light source unit 80. That is, the CPU 90a can not only control the WSS93 to select an even channel from the dummy light input from the second dummy light source unit 80, but also perform the following control. That is, the CPU 90a can also control to deselect the even-numbered channels from the dummy light input from the first dummy light source unit 70 and only select the odd-numbered channels.

In the optical wavelength division multiplexing transmission device 9 according to the present embodiment having the above configuration, the number of WSS is reduced from two to one with respect to the optical wavelength division multiplexing transmission device 3 of the second embodiment. However, also in this embodiment, the dummy light adjustment process, the recovery process at the time of abnormality (when a failure occurs), and the recovery process after replacing the failure unit are all carried out based on the same concept as the process described in the second embodiment. be able to.

As described above, according to the present embodiment, in addition to the effect of the second embodiment, there is an effect that the selection unit for selecting the dummy light channel exemplified by WSS can be reduced.

<Other embodiments>
In each of the above-described embodiments, the functions of each part of the optical transmission device have been described, but it is sufficient that these functions can be realized as an optical transmission device, an optical wavelength multiplex transmission device, an optical wavelength multiplex separation device, or the like. In addition, the various examples described in each embodiment can be combined as appropriate. Further, the optical transmission device can also be incorporated into an optical communication system other than the submarine optical cable system.

Further, the optical transmission device according to each embodiment, the wave-binding unit thereof, and the external monitoring and control device can have, for example, the following hardware configurations. FIG. 19 is a diagram showing an example of a hardware configuration of a part of each device according to each embodiment.

The device 100 shown in FIG. 19 has a processor 101, a memory 102, and an interface 103. When the device 100 is an optical transmission device or a wave junction thereof, the interface 103 can be an interface with an optical device (PD, optical coupler, optical splitter, etc.) (not shown) or an interface with an external monitoring and control device. .. The functions of the respective parts described in each embodiment are realized by the processor 101 reading the program stored in the memory 102 and executing the program in cooperation with the interface 103. This program can be the program described in the first embodiment or the program incorporating the application examples in the second and third embodiments. When the device 100 is an external monitoring and control device, the interface 103 can have an interface for connecting to the optical transmission device, an operation interface for the user to make settings, and the like.

In the above example, the program can be stored and supplied to a computer using various types of non-transitory computer readable medium. Non-temporary computer-readable media include various types of tangible storage media. Examples of non-temporary computer-readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical disks). Further, this example includes a CD-ROM (Read Only Memory), a CD-R, and a CD-R / W. Further, this example includes semiconductor memories (eg, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory)). The program may also be supplied to the computer by various types of transient computer readable medium. Examples of temporary computer readable media include electrical, optical, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

It should be noted that the present disclosure is not limited to the various embodiments described above, and can be appropriately modified without departing from the spirit. Further, the present disclosure may be carried out by appropriately combining the respective embodiments.

Some or all of the above embodiments may also be described, but not limited to:
(Appendix 1)
A combiner that combines the signal light of the main signal, the odd-numbered channel dummy light using the first dummy light source as the light source, and the even-channel dummy light using the second dummy light source as the light source.
A detection unit that detects an abnormality in the first dummy light source and an abnormality in the second dummy light source,
When there is no abnormality in the first dummy light source in the detection unit and an abnormality in the second dummy light source is detected, dummy light of an even channel using the first dummy light source as a light source is additionally added in the combine unit. When the signal light of the signal is combined and the detection unit does not have an abnormality in the second dummy light source and an abnormality in the first dummy light source is detected, an odd number using the second dummy light source as a light source in the combine unit. A control unit that performs additional control so that the dummy light of the channel is additionally combined with the signal light of the main signal.
Equipped with an optical transmission device.
(Appendix 2)
The first dummy light source outputs the odd-numbered channel dummy light.
The second dummy light source outputs the even-numbered channel dummy light.
The combiner combines the signal light of the main signal, the dummy light input from the first dummy light source, and the dummy light input from the second dummy light source.
The detection unit detects the abnormality of the odd-numbered channel dummy light and the abnormality of the even-numbered channel dummy light, thereby detecting the abnormality of the first dummy light source and the abnormality of the second dummy light source, respectively.
The control unit, as the additional control,
When the detection unit detects that the first dummy light source has no abnormality and the second dummy light source has an abnormality, the first dummy light source is controlled to additionally output the dummy light of the even-numbered channel.
When the detection unit detects that the second dummy light source has no abnormality and the first dummy light source has an abnormality, the second dummy light source is controlled to additionally output the dummy light of the odd-numbered channel.
The optical transmission device according to Appendix 1.
(Appendix 3)
The combiner selects the odd-numbered channel dummy light from the dummy light input from the first dummy light source and inputs it from the second dummy light source as the dummy light to be combined with the signal light of the main signal. It has a selection unit for selecting the even-numbered channel dummy light from the dummy light.
The detection unit detects an abnormality in the dummy light input from the first dummy light source and an abnormality in the dummy light input from the second dummy light source, so that the abnormality in the first dummy light source and the abnormality in the second dummy light source are detected, respectively. Detects anomalies in the dummy light source and detects
The control unit, as the additional control,
When the detection unit does not have an abnormality in the first dummy light source and an abnormality in the second dummy light source is detected, the dummy light input from the first dummy light source to the selection unit is used to detect even-numbered channel dummy light. Also control to select additionally,
When there is no abnormality in the second dummy light source and the abnormality of the first dummy light source is detected by the detection unit, the dummy light of the odd channel from the dummy light input from the second dummy light source to the selection unit is detected. Also controls to select additionally,
The optical transmission device according to Appendix 1.
(Appendix 4)
When either the first dummy light source or the second dummy light source in which an abnormality is detected is replaced after the additional control, the control unit performs a return control to return to the state before executing the additional control. ,
The optical transmission device according to any one of Supplementary note 1 to 3.
(Appendix 5)
The odd-numbered channels and the even-numbered channels are odd-numbered channels and even-numbered channels in a group of channels arranged in order according to the magnitude relationship of wavelength or frequency, respectively.
The optical transmission device according to any one of Supplementary note 1 to 4.
(Appendix 6)
The odd-numbered channel is a channel in which the value of a predetermined number of digits at the center wavelength or the center frequency is an odd number.
The even-numbered channel is a channel having an even-numbered value of the predetermined number of digits.
The optical transmission device according to any one of Supplementary note 1 to 4.
(Appendix 7)
The additional control includes a control for adjusting the optical output power of the dummy light of the channel in which the abnormality is detected to be compensated by the optical output power of the dummy light of the channel added to the signal light of the main signal.
The optical transmission device according to any one of Supplementary note 1 to 6.
(Appendix 8)
A combined wave step that combines the signal light of the main signal, the odd-numbered channel dummy light using the first dummy light source as the light source, and the even-channel dummy light using the second dummy light source as the light source.
A detection step for detecting an abnormality between the first dummy light source and the second dummy light source,
When there is no abnormality in the first dummy light source in the detection step and an abnormality in the second dummy light source is detected, dummy light of an even channel using the first dummy light source as a light source is additionally added in the combined wave step. When the signal light of the signal is combined and there is no abnormality in the second dummy light source in the detection step and an abnormality in the first dummy light source is detected, an odd number using the second dummy light source as a light source in the combined wave step. A control step for performing additional control so that the dummy light of the channel is additionally combined with the signal light of the main signal.
An optical transmission method.
(Appendix 9)
The control step performs return control to return to the state before executing the additional control when any of the first dummy light source and the second dummy light source in which the abnormality is detected is replaced after the additional control. Have a step,
The optical transmission method according to Appendix 8.
(Appendix 10)
The odd-numbered channels and the even-numbered channels are odd-numbered channels and even-numbered channels in a group of channels arranged in order according to the magnitude relationship of wavelength or frequency, respectively.
The optical transmission method according to Appendix 8 or 9.
(Appendix 11)
The odd-numbered channel is a channel in which the value of a predetermined number of digits at the center wavelength or the center frequency is an odd number.
The even-numbered channel is a channel having an even-numbered value of the predetermined number of digits.
The optical transmission method according to Appendix 8 or 9.
(Appendix 12)
The additional control includes a control for adjusting the optical output power of the dummy light of the channel in which the abnormality is detected to be compensated by the optical output power of the dummy light of the channel added to the signal light of the main signal.
The optical transmission method according to any one of Supplementary note 8 to 11.
(Appendix 13)
A computer equipped with an optical transmission device that combines the signal light of the main signal, the odd-channel dummy light using the first dummy light source as the light source, and the even-channel dummy light using the second dummy light source as the light source. ,
A detection step for detecting an abnormality between the first dummy light source and the second dummy light source,
When there is no abnormality in the first dummy light source and an abnormality in the second dummy light source is detected in the detection step, dummy light of an even channel using the first dummy light source as a light source is additionally added to the signal light of the main signal. When the waves are combined and there is no abnormality in the second dummy light source in the detection step and an abnormality in the first dummy light source is detected, an odd-channel dummy light using the second dummy light source as a light source is additionally added to the main signal. A control step that performs additional control so that it is combined with the signal light of
A program to execute.
(Appendix 14)
The control step performs return control to return to the state before executing the additional control when any of the first dummy light source and the second dummy light source in which the abnormality is detected is replaced after the additional control. Have a step,
The program described in Appendix 13.
(Appendix 15)
The odd-numbered channels and the even-numbered channels are odd-numbered channels and even-numbered channels in a group of channels arranged in order according to the magnitude relationship of wavelength or frequency, respectively.
The program according to Appendix 13 or 14.
(Appendix 16)
The odd-numbered channel is a channel in which the value of a predetermined number of digits at the center wavelength or the center frequency is an odd number.
The even-numbered channel is a channel having an even-numbered value of the predetermined number of digits.
The program according to Appendix 13 or 14.
(Appendix 17)
The additional control includes a control for adjusting the optical output power of the dummy light of the channel in which the abnormality is detected to be compensated by the optical output power of the dummy light of the channel added to the signal light of the main signal.
The program according to any one of Supplementary Provisions 13 to 16.

1 Optical transmission device 1a, 30, 90 Wave wave section 1b Detection section 1c Control section 3, 9 Wavelength division multiplexing transmission device 4 External terminal device 10, 70 First dummy light source section 11, 21, 71, 81 ASE light source 12, 22, 93 WSS
20, 80 Second dummy light source unit 30a, 90a CPU
30b, 90b Non-volatile memory 31, 32, 37, 91, 92, 97 PD
33, 34 Optical coupler 35, 36, 95, 96 Optical splitter 38, 98 OCM
100 Device 101 Processor 102 Memory 103 Interface

Claims (10)

A combiner that combines the signal light of the main signal, the odd-numbered channel dummy light using the first dummy light source as the light source, and the even-channel dummy light using the second dummy light source as the light source.
A detection unit that detects an abnormality in the first dummy light source and an abnormality in the second dummy light source,
When there is no abnormality in the first dummy light source in the detection unit and an abnormality in the second dummy light source is detected, dummy light of an even channel using the first dummy light source as a light source is additionally added in the combine unit. When the signal light of the signal is combined and the detection unit does not have an abnormality in the second dummy light source and an abnormality in the first dummy light source is detected, an odd number using the second dummy light source as a light source in the combine unit. A control unit that performs additional control so that the dummy light of the channel is additionally combined with the signal light of the main signal.
Equipped with an optical transmission device. The first dummy light source outputs the odd-numbered channel dummy light.
The second dummy light source outputs the even-numbered channel dummy light.
The combiner combines the signal light of the main signal, the dummy light input from the first dummy light source, and the dummy light input from the second dummy light source.
The detection unit detects the abnormality of the odd-numbered channel dummy light and the abnormality of the even-numbered channel dummy light, thereby detecting the abnormality of the first dummy light source and the abnormality of the second dummy light source, respectively.
The control unit, as the additional control,
When the detection unit detects that the first dummy light source has no abnormality and the second dummy light source has an abnormality, the first dummy light source is controlled to additionally output the dummy light of the even-numbered channel.
When the detection unit detects that the second dummy light source has no abnormality and the first dummy light source has an abnormality, the second dummy light source is controlled to additionally output the dummy light of the odd-numbered channel.
The optical transmission device according to claim 1. The combine unit selects the odd-numbered channel dummy light from the dummy light input from the first dummy light source as the dummy light to be combined with the signal light of the main signal, and is input from the second dummy light source. It has a selection unit for selecting the even-numbered channel dummy light from the dummy light.
The detection unit detects an abnormality in the dummy light input from the first dummy light source and an abnormality in the dummy light input from the second dummy light source, so that the abnormality in the first dummy light source and the abnormality in the second dummy light source are detected, respectively. Detects anomalies in the dummy light source and detects
The control unit, as the additional control,
When there is no abnormality in the first dummy light source and the abnormality of the second dummy light source is detected by the detection unit, the dummy light of the even channel from the dummy light input from the first dummy light source to the selection unit. Also control to select additionally,
When there is no abnormality in the second dummy light source and the abnormality of the first dummy light source is detected by the detection unit, the dummy light of the odd channel from the dummy light input from the second dummy light source to the selection unit is detected. Also controls to select additionally,
The optical transmission device according to claim 1. When either the first dummy light source or the second dummy light source in which an abnormality is detected is replaced after the additional control, the control unit performs a return control to return to the state before executing the additional control. ,
The optical transmission device according to any one of claims 1 to 3. The odd-numbered channels and the even-numbered channels are odd-numbered channels and even-numbered channels in a group of channels arranged in order according to the magnitude relationship of wavelength or frequency, respectively.
The optical transmission device according to any one of claims 1 to 4. The odd-numbered channel is a channel in which the value of a predetermined number of digits at the center wavelength or the center frequency is an odd number.
The even-numbered channel is a channel having an even-numbered value of the predetermined number of digits.
The optical transmission device according to any one of claims 1 to 4. The additional control includes a control for adjusting the optical output power of the dummy light of the channel in which the abnormality is detected to be compensated by the optical output power of the dummy light of the channel added to the signal light of the main signal.
The optical transmission device according to any one of claims 1 to 6. A combined wave step that combines the signal light of the main signal, the odd-numbered channel dummy light using the first dummy light source as the light source, and the even-channel dummy light using the second dummy light source as the light source.
A detection step for detecting an abnormality between the first dummy light source and the second dummy light source,
When there is no abnormality in the first dummy light source in the detection step and an abnormality in the second dummy light source is detected, dummy light of an even channel using the first dummy light source as a light source is additionally added in the combined wave step. When the signal light of the signal is combined and there is no abnormality in the second dummy light source in the detection step and an abnormality in the first dummy light source is detected, an odd number using the second dummy light source as a light source in the combined wave step. A control step for performing additional control so that the dummy light of the channel is additionally combined with the signal light of the main signal.
An optical transmission method. The control step performs return control to return to the state before executing the additional control when any of the first dummy light source and the second dummy light source in which the abnormality is detected is replaced after the additional control. Have a step,
The optical transmission method according to claim 8. A computer equipped with an optical transmission device that combines the signal light of the main signal, the odd-channel dummy light using the first dummy light source as the light source, and the even-channel dummy light using the second dummy light source as the light source. ,
A detection step for detecting an abnormality between the first dummy light source and the second dummy light source,
When there is no abnormality in the first dummy light source and an abnormality in the second dummy light source is detected in the detection step, dummy light of an even channel using the first dummy light source as a light source is additionally added to the signal light of the main signal. When the waves are combined and there is no abnormality in the second dummy light source in the detection step and an abnormality in the first dummy light source is detected, an odd-channel dummy light using the second dummy light source as a light source is additionally added to the main signal. A control step that performs additional control so that it is combined with the signal light of
A program to execute.

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